tracheid defined in 1951 yeartracheid - tracheid;
tracheid - Non-living element of xylem formed from a single cell. Elongated, with tapering ends and with thick, lignified, and pitted walls. It is a long, empty, firm-walled tube running parallel with long axis of the organ in which it lies, overlapping and in communication with adjacent tracheids by means of pits. Functioning in water conduction and in mechanical support. Primitive compared with vessel. Characteristic of vascular plants other than flowering plants.
near tracheid in Knolik
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